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Forum: Pentax News and Rumors 9 Hours Ago  
HD Pentax DA * 16-50mm F2.8ED PLM AW is the second one.
Posted By jatrax
Replies: 211
Views: 17,519
I think they said they were going to try and have it for the K-3III release but were not sure they could make it. With the delay of the K-3III perhaps that makes it more likely they will both come out together. Or not.
Forum: Pentax Medium Format 9 Hours Ago  
Pentax 645Z next model
Posted By jatrax
Replies: 121
Views: 8,139
Actually that is true for most things.


- I can sit in a race car and probably drive it around the track as could most people but maybe .1% of population could actually use it properly

- my son is a heavy equipment operator, I can sit in the cab and work the levers but all I do is make a mess. He has a gift that lets him make it look easy

- I can pick up a brush and oil paints at the local store and pretend I am a painter but all I would produce would be a blob

Many people can pick up a tool and try to use it but in all things some are better than others and usually only a tiny percentage have the combination of skill and dedication to become really good. And for those few the tool often matters very little, they can produce amazing results with the poorest of equipment.

I think I could become a good photographer (not world class, but good) if I quit my day job and dedicated myself all day, every day to learning the craft. Unfortunately I would starve before I achieved the level of "goodness" required to make a living at it.
Forum: Pentax SLR Lens Discussion 2 Days Ago  
SDM failure
Posted By jatrax
Replies: 24
Views: 974
I converted my original 60-250 to FF, one of the earliest ones done actually. But I still found the corners dark. Not unacceptable but still needing correction at some focal lengths.

I sold it because the focusing speed was slow enough I found it irritating. So I am now using my Pentax-F 70-210. Which is also somewhat irritating.... :)
Forum: Pentax Medium Format 2 Days Ago  
Pentax 645Z next model
Posted By jatrax
Replies: 121
Views: 8,139
DA*11-18?
DA 55-300 PLM?
Announced DA*16-50 PLM?



Higher frames per second? Lighter weight?
Things will always change back and forth as new cameras are released, I just think we need to stop making the automatic assumption that smaller sensor = smaller price.
Forum: Pentax Medium Format 2 Days Ago  
Pentax 645Z next model
Posted By jatrax
Replies: 121
Views: 8,139
Perhaps we need to get away from connecting price to sensor size and rather use camera capabilities. K-3III can do things no K-1 or 645 can do. It depends on what is required for a particular use case. If the K-3III does what a person needs better than a K-1 or 645 then why would the value be assumed to be less? Just because we have always used sensor size to judge cost? The sensor is a key component but I would theorize it is no longer the sole cost metric of a camera.
Forum: Pentax K-30 & K-50 2 Days Ago  
Aperture problem
Posted By jatrax
Replies: 12
Views: 543
Yes, and perhaps he does but that is not clear. Apparently his M42 are from his film years but again that is not clear. Hopefully he will report back as we still do not know what lenses he is using, M42 or K-mount. Hard to help when not all information is provided.
Forum: Pentax SLR Lens Discussion 2 Days Ago  
SDM failure
Posted By jatrax
Replies: 24
Views: 974
There was a report at one point from a quote of a Pentax rep at one of the photo shows that vaguely indicated new build lenses had a change that 'fixed' the issue. It has been years but I'm sure it is still on the forum someplace. The biggest indicator that something changed is that the number of SDM lens failures is greatly reduced from what it was. That indicates to me that older lenses that were going to fail have failed and newer lenses have less of a chance of failing Not no chance, just a more 'normal' failure rate that is in line with industry norms. I suppose @UncleVanya would have a better sense of what the trend is and whether it is new or older lenses that are failing than I would. My impression is just from reading the topics on this forum and observing the change over the years.

My 16-50 motor failed and it was converted to screw drive
My 60-250 motor failed and I had the motor replaced at a repair shop and then sold it on.

I am considering buying a new 60-250 but since most of my work is now FF I hesitate. Not because of the motor as I do think new ones would have an acceptable failure rate but because I cannot decide between 60-250 and 70-210.
Forum: Pentax K-30 & K-50 3 Days Ago  
Aperture problem
Posted By jatrax
Replies: 12
Views: 543
Yes, but I suspect the OP is looking for the aperture info to show on the camera. Which is not going to happen on a non-A position lens. It will just show "F___" because the camera has no way to determine what the aperture ring is set to.
Forum: Pentax K-30 & K-50 4 Days Ago  
Aperture problem
Posted By jatrax
Replies: 12
Views: 543
What lens are you using? Unless it is Pentax-A or newer the camera has no way to read the aperture and will just show "F__". You have to follow the instructions in the tutorial for stop down metering.
Forum: Troubleshooting and Beginner Help 01-14-2021, 11:24 AM  
K zoom lens not focusing ?
Posted By jatrax
Replies: 9
Views: 479
Prime lens = a single focal length such as 28mm or 50mm
Zoom lens = a variable focal length lens such 28-80 or 70-200

Your ME Super probably came with either a 50mm or 28mm lens. It is from the 1980's and I think the lens series would be Pentax-M. Check to see what your 28mm says on it. If it is Pentax-M then search for other lenses in that series. A standard kit from those days would have been a 28mm (or 35mm) a nice 50mm (either f/1.7 or f/1.4) and perhaps a longer 135mm tele-photo.

Zooms of that era were not particularly good and personally I would avoid them and just go with a nice set of primes.
Forum: Troubleshooting and Beginner Help 01-14-2021, 10:11 AM  
K zoom lens not focusing ?
Posted By jatrax
Replies: 9
Views: 479
I do not have that lens but other lenses of that era that I do have worked that way. Acting as a normal lens with a fairly hard 'stop' at the end of the zoom range that you could click through to go into macro mode. Without actually handling it I cannot say for sure but it seems possible the lens is damaged and stuck in macro mode.

Unless the lens has sentimental value I would just source a different one from ebay. Check the lens reviews here on the forum and get a 'new' used one. That lens does not have a great reputation so I would likely go with a couple of primes lenses that are of the same series as your 28mm.
Forum: Troubleshooting and Beginner Help 01-13-2021, 06:36 PM  
K zoom lens not focusing ?
Posted By jatrax
Replies: 9
Views: 479
This lens perhaps: Takumar-A 28-80mm F3.5-4.5 Reviews - Non-SMC Pentax Zoom Lenses - Pentax Lens Reviews & Lens Database

It does indeed have a macro setting but it should focus normally between 28 and 70 something and then click into the macro setting where it will not focus to infinity but rather whatever close focus limit it has.
Forum: Pentax SLR Lens Discussion 01-13-2021, 03:13 PM  
Get the 70-210 f4 or wait to the new 65-300 f5.6 SR lens
Posted By jatrax
Replies: 59
Views: 1,967
I've been debating for some months on whether to buy the DFA 70-210 or re-buy the DA*60-250. The 60ish-300ish would likely be a good choice for me if it were available. At this point I'm not really sold on either the 70-210 or the 60-250. What I want is a new DFA*60-250 with modern motor and complete FF compatibility. But I doubt very much that will ever happen so the 60ish-300 might end being the choice.
Until I decide the F 70-210 is in the bag and working just fine.
Forum: Pentax News and Rumors 01-13-2021, 10:18 AM  
Guangzhou | K-3 Mark III preview meeting
Posted By jatrax
Replies: 184
Views: 18,521
Of course, that makes sense. More than my vision of a series of carbon fiber versions of vintage * glass....................
Forum: Pentax News and Rumors 01-13-2021, 09:21 AM  
Guangzhou | K-3 Mark III preview meeting
Posted By jatrax
Replies: 184
Views: 18,521
I wonder why they would make a carbon fiber A*85 f/1.4?
Forum: Pentax SLR Lens Discussion 01-11-2021, 12:44 PM  
What is the purpose of the 15mm limited?
Posted By jatrax
Replies: 168
Views: 6,449
Just go here: The 15mm Limited controls my mind - club - PentaxForums.com

I sold mine when I moved to FF but still regret it.
Forum: Troubleshooting and Beginner Help 01-09-2021, 10:23 AM  
Pentax 60-250 mm
Posted By jatrax
Replies: 32
Views: 1,616
For some time the 60-250 was my most used lens. The focal length is spot on for a lot of the landscape shots I take. The optical quality is superb. I modified mine for FF and used it on the K-1 as well with good success. However, I eventually sold it in anticipation of the announced DFA 70-210 f/4.

Pluses:
- * quality optics. Just superb.
- weather sealed
- reasonable weight for a lens of this quality (1,230 gm)

Minuses:
- slow focusing. Totally fine for landscape and reasonable normal shots but forget any kind of action / movement
- SDM focusing motor has a higher failure rate than I like
- some vignetting on FF even after the FF modification. Not bad really, but noticeable.
- weight while reasonable is a lot more than the DFA 70-210 f/4 (859 gm)

I am still debating on whether to buy the DA*60-250 again or get the new DFA 70-210 f/4. They both have pluses and minuses. If the 60-250 was screw drive convertible I would never have sold mine and I would buy a new one to replace it even now. But for me the SDM motor is just too slow, it got really aggravating to the point I disliked using the lens. I did not find the weight to be an issue, I never thought the focus breathing was an issue for my photography and of course the images were superb.

There simply is no replacement for this lens in the Pentax line. If you do not need really fast focusing I strongly recommend it. New ones do not seem to have any unusual SDM failures but the motor is still slow. And no one will fault the optics.

One reason you do not see a lot for sale is that owners don't sell them often. The lens is a keeper.
Forum: General Photography 01-06-2021, 05:28 PM  
Canon Sessions-have Canon ambassadors discuss your work with you....
Posted By jatrax
Replies: 18
Views: 872
Maybe not, many of those ambassadors have photo training businesses. So this would just be an add on to that and a way for them to "advertise" their more in depth services. Without face to face meetings a lot of people who make their living as presenters at seminars or do photo education safaris are hurting for work. I would assume the ambassadors would also be compensated for the time they spend in these 'chats'.
Forum: Pentax DSLR Discussion 01-06-2021, 01:20 PM  
Pentax K10d issue after click
Posted By jatrax
Replies: 11
Views: 554
Fully charged does not mean it still has the required voltage. I am going by memory but something similar occurred on I think K-5 or a model of about that age. If the battery was low, not quite up to spec, it would cause issues with the shutter actuation. I am not sure this at all the same, probably not but it would be the easiest thing to check and eliminate.

As to why it happens? Way out of my area of expertise. I could guess that something has worn enough to cause a little more friction or binding. Or the battery does not have enough power. Or something else but I am only guessing.

Perhaps, if you have a friendly local shop they could take a look and give you an idea of what is wrong and if it might be repairable. They might also have a new or newer battery to test with.
Forum: Pentax DSLR Discussion 01-06-2021, 11:40 AM  
Pentax K10d issue after click
Posted By jatrax
Replies: 11
Views: 554
K10D is now at least 12 years old since it was discontinued in 2008. It may have reached end of life depending on the number of exposures it has taken. Do you know how many that is?


One thing that you might check is the battery itself. An older battery may no longer hold enough charge and without it the shutter sequence may fail at some point. That is just a theory but a new battery may prove or disprove that. Does the shutter get stuck all the time or just some times? Does it work better with a fully charged battery?

Other than that I think you are looking at sending it to a repair shop. And I fear the cost of repair will exceed a newer working body obtained used.
Forum: Pentax K-1 01-06-2021, 09:54 AM  
K-1 i vs K3 III Just discussion.
Posted By jatrax
Replies: 17
Views: 1,346
Nothing but wishful thinking, though it is a logical progression. But it might be several years before that happens.


I shoot with both a K-3II and a K-1II depending on the shoot. For day to day shots it is difficult to see much of a difference but for things on the edge such as astro, sunset, low light etc the K-1II images have a clear edge. However, I do not plan to give up on APS-C yet, I find both formats have their place. At this point my only remaining APS-C lens is the DA 16-85, everything else is FF and is shared on both cameras.

In your case if you move to a K-1 at some point you will need to replace nearly all of your glass, assuming your Tamron is FF capable. Based on that and your desire to buy a K-3III it would seem a move to FF might be in the far future. I would not expect a K-1III until late 2022 or 2023 and the cost of new glass to support it will be significant.
Forum: Photographic Technique 01-05-2021, 03:00 PM  
Idiots intro to IR on K100d super please
Posted By jatrax
Replies: 11
Views: 665
I started with a K-3II and a 720 filter. As baro-nite says you need a tripod, very long exposures, and will likely need to focus with the filter off then put it on and take the shot. One potential issue is that the focus on an IR image may be off from a visible light focus setting. So you may have to adjust, which will be trial and error on your camera.

I've since purchased a full spectrum converted K-01, which makes things a lot easier.

Read through the information on the Kolari site, you may end up doing things differently but the info there will get you a base to start from.
Forum: Photographic Technique 01-05-2021, 01:35 PM  
Idiots intro to IR on K100d super please
Posted By jatrax
Replies: 11
Views: 665
Forum: Pentax KP 01-05-2021, 12:53 PM  
Using the HD Pentax-DA 55-300mm f/4.5-6.3 ED PLM WR RE
Posted By jatrax
Replies: 28
Views: 824
Perhaps it should also be noted that the "crippled" mount includes all Pentax DSLRs and even some film bodies, so its not by any means a KP thing. The complaints about a "crippled" mount mostly come from people who have a collection of very old glass (1970s - 1980s) and perhaps at one time used that glass on fully compatible cameras. Most of us would never have actually used a non-crippled mount.
Forum: Pentax KP 01-05-2021, 10:19 AM  
Using the HD Pentax-DA 55-300mm f/4.5-6.3 ED PLM WR RE
Posted By jatrax
Replies: 28
Views: 824
KP does not have KAF4, it is KAF2. My bad for posting the KAF4 in error. KP is compatible with all Pentax made lenses. Including M42 ones with an adapter. And it might need a firmware upgrade to work with KAF4 lensesOthers will have a better explanation but the "crippled" mount lacks the ability to sense the actual aperture that is set on the lens by the aperture ring. I believe that would be lenses earlier than the "A" series. So the only issue with the KP is that it cannot sense the aperture setting of very old lenses. The work around is using stop down metering so it will work with all Pentax lenses but you need a bit of a work around for "K" and "M" series lenses.
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